Simon Cowell's secret wig

The Irish music mogul - who returned to the judging panel on the British TV talent show earlier this year after being fired - has noticed that 48-year-old Simon never seems to age, and is convinced he is getting help to stay looking youthful.

He said: "I think Simon's had some surgery done this year. He looks so different from last year. He hasn't got a single wrinkle or grey hair. I reckon it's a wig - it never moves!"

Louis admits sitting alongside Simon and the other two judges Sharon Osbourne and Dannii Minogue has inspired him to go under the knife.

He told New! magazine: "I'd definitely consider having surgery. Sharon and Dannii have had so much done - nips, tucks, everything! But they look great."

Both Sharon and Dannii have undergone a variety of cosmetic procedures.

Australian pop singer Dannii has confessed to having Botox and is rumoured to have had a nose job, breast implants and collagen injections.

Sharon has previously admitted to spending over £300,000 on plastic surgery, including liposuction, a tummy tuck, Botox, a boob job, a facelift and a butt lift.